/*
 * zmq.c
 *
 * Copyright (C) 2016-22 - ntop.org
 *
 * nDPI is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * nDPI is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with nDPI.  If not, see <http://www.gnu.org/licenses/>.
 *
 */
#include "ndpi_protocol_ids.h"

#define NDPI_CURRENT_PROTO NDPI_PROTOCOL_ZMQ

#include "ndpi_api.h"
#include "ndpi_private.h"

static const u_int8_t zmtp_signature[] = { 0xFF, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x7F };

static void ndpi_search_zmq(struct ndpi_detection_module_struct *ndpi_struct, struct ndpi_flow_struct *flow)
{
  struct ndpi_packet_struct const * const packet = &ndpi_struct->packet;

  NDPI_LOG_DBG(ndpi_struct, "search ZMQ\n");

  if (packet->payload_packet_len > 9) {
    if (memcmp(packet->payload, zmtp_signature, sizeof(zmtp_signature)) == 0) {
      ndpi_set_detected_protocol(ndpi_struct, flow, NDPI_PROTOCOL_ZMQ,
                                 NDPI_PROTOCOL_UNKNOWN, NDPI_CONFIDENCE_DPI);
      NDPI_LOG_INFO(ndpi_struct, "found ZMQ\n");
      return;
    }
  }

  NDPI_EXCLUDE_DISSECTOR(ndpi_struct, flow);
}


void init_zmq_dissector(struct ndpi_detection_module_struct *ndpi_struct)
{
  register_dissector("ZeroMQ", ndpi_struct,
                     ndpi_search_zmq,
                     NDPI_SELECTION_BITMASK_PROTOCOL_V4_V6_TCP_WITH_PAYLOAD_WITHOUT_RETRANSMISSION,
                     1, NDPI_PROTOCOL_ZMQ);
}
